Typewriting-machine



A. G. F. KUROWSKI.

TYPEWRITING, MACHINE. APPLICATION FILED NOV. \8, 191a.

Patented J 11110 29, 1920.

2 SHEETSSHEET I.

A. G. F.'KURO.WSKI.

' TYPEWRITlNG MACHINE.

APPLICATION FILED Nov.18. 191s.

Patented J une 29, 1920.

2 SHEETS-SHEET 2 w w I .1? Q 0% R QKNRN ww .wn

city and State of New certain new and useful Improvements in Fig. 2,

* UNITED S TES)" rATEnroFFic ALFRED. G. r. KUROWSKI, o1 BBO'OKYLN, ivnwoiucnssienon 'ro Ummnwoon TYPEWRITER COMPANY, on, nnw YORK, N. Y., aCORPORATION or DELA WARE.

To all'whom it may concern: p

Be it known that I, ALFRED G. F. KURow- SKI, a subject of the Emperor ofGermany, but having taken out preliminary United States naturalizationpapers, residing in Brooklyn borough, in the county of -Kings, York,have invented Typewriting-Machines, of which'the followin is aspecification. 1

This invention relates to typewritingmachines, and is herein disclosedas applied to the line-space mechanisinof an Underwood i ty oewritingmachine.

he line-spacing operation in typewriting machines is often accompaniedwith a great deal of noise, and the efi'ort required for theline-spacing operation isconsiderable, both of these facts largelyresulting from the employment of a line-space detent, which is needed tohold the platen properly alined during the writing operation. Thepresent invention is directed to eliminating this noise and to reducingthe amount of effort required for the operation of turning the platen,especially in line-spacing.

In embodying the invention in an Under-, wood typewriting machine, ithas been found advantageous to provide a cam fast to the slide formingpart of the usual. line-space mechanism, so that said cam may strike abell-crank arm provided on the usual linespace detent arm, with theresult that the initial movement of the usual slide in linespacingwillcarry the detent'clear of the line-space wheel, and thus permit theplaten to turn freely. The cam is'advantageously so formed that thedetent engages the linespace wheel at the end of the throw of the slide,thus holding the platen all the time when not actually driven.

Other features and'advantages will hereinafter appear. v I

In the accompanying drawings, I 1

Figure 1 is an end viewof part ofthe carriage of an Underwoodtypewriting ma- 'ng the present invention as apchine, showi pliedthereto. Fig. 2 is a plan view Fig.1, parts being broken away;

Fig. 8 is a front view of theparts seen in with some of the partsremoved.

Fig. 4 is a view ofpart of Fig.1, with the line-space slide beginning toturn the platen";

of the parts'seen in f 14 and 28" carries the cam 26 along 7ryrnwarrme-macnmn.

Patented n 29,1920.

Application filed November 18, 1918. S erial No. 262,923.

Fig. 5 is a similar view, showing the slide i at the end of theline-spacemovement.

' Fig. 6 is a similar view,'but with the slide partly returned tonormalposition. 7

Fig. 7 is a perspective view of the linespaceldetent arm.

When the usual line-space handle 9 is operatedto turn the platen 10,it'swings about its pivot 11 so that the usual short arm 12 strikes theturned-over end 13 0f the'usual slide 14, carrying said slide rearwardlyagainst thetension of-its spring 15, which is attached to the slide by apinor post 16. The slide is provided with a pawl 17 Y pivoted thereon at18 and normally held out of the line-space ratchet wheel 19 by anadjustable shelf 20 on which it rests. Upon actuation of the handle 9,the pawl is carried rear- --ward1y by the slide 14 dropping off theshelf 20into the teeth of the line-space wheel 19,

- which is fast to the platen 10, thereby rotating the wheel one or moreline spaces until the pawl is arrested by the usual-oven throw stop21*which forces the pawl 17 in between the teeth of the wheel 19,- thereby preventing overthrow of the platen.

The platen is held against rotation in its position of rest by means ofa detent roll22 on-the end ofan arm 23 which is pivoted on theplatenframe at 24, and is strongly pressed'against-the wheel 19 by aspring 25.

According to the present invention whenever the line-space lever 9 isactuated, a cam or follower 26, forming the lower end of abell-crank arm27 "pivoted at 28 on a supplementary slide 28, connected by the pin 16to move as a unit with the slide 14, is adapted to strike and camdownwardly the short offset arm 29 fast to the detent arm 23, thuscarrying the roll 22 clear of the wheel 19, and thus enabling the platento turn without: operating the detent. In :order to do this mosteffectively, the cam 26 strikes a. curved cut-out cam face 30 on the arm29, so that the follower 26, which normally stands just clear of,- orjust touching, the arm 29, may start said arm'down with increasingrapidity until it is fully depressed at "a point 31, corresponding tothe momentthe pawl 17 begins to turn the platen. Further movement'of theslides a flat portion 32 of the arm 29, thus holding the detent T011 22clear of the platen until the slide 14 is arrested by having its pawlstrike Fig. 6 position, in which it rides idly overv able the pinyltiitormove the necessary a Fig. 1 position. i

the parts. 125 1 the stop 21. At the moment when the slide 14 isarrested, the follower 26 drops into a cut-away portion 83 on the arm29, thus allowing the detent roll 22 tobe snapped back against theplaten by its spring 25.

The typist then releases the line-space lever 9, so that its springdraws back the slides 14 and 28, and the bell-crank 27 rocks to the thesmooth portion 32 and finally drops into Inv order to-prevent thebell-crank 27 from yielding upwardly when it strikesthe cam 30, theslide 28 is, provided with a lug 34 overlying thearm 35 of'thebell-crank, and

said arm is held against the lug 84 by a light spring 36, thus normallyholding it .in position to actuate the arm .29. Since the throw of theslide 14is uniform, the usual handle 37., for shifting the shelf'20 tovary thethrow of vthe platen by the line-space lever, in no wayinterferes with the operation-of the cam 26 orthe proper timing of Toconnect the'slides 14 and 28, the usualpin 16 is utilized, it beingthreaded or riveted .into both slides. The slide 28 is mounted, ontheoutside plate 38 of the shiftframe, and is: adapted to slide thereonbecause it is provided with slots 39 through which pass shoulderedscrews 40. To enamount, there is provided a slot 41 in the plate 38,through which the pin .16 passes. The slot 41 may be of precisely theright length for the proper throw of the slide 14. 7

,- It will beobserved that the amount of noise eliminated isconsiderable, since a great 'deal, if not most, typewriting is done withthe lines spaced apart twov or three minimum line spaces, with theresult that the line-space detent usually clicks over two or three teethof the ratchet wheel. 7

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others. Having thusdescribed my invention, I

. claim 1. In a typewriting machine, the combination with a' rotatableplaten and a detent therefor, of a ratchet wheel connected to the platenhaving teeth to cooperate with said detent, a line-space driving devicecomprising a reciprocating member to turn the platen a single line spaceso that the detent will engage anothertooth, and connections, wherebythe driving operation of said member moves said detent clear of saidwheel while the point of any tooth passes the detent.

2. In a typewriting machine, the combination with a rotatable platen.and a detent therefor, of a ratchet wheel connected to the platen havingteeth to cooperate with said detent, a line-space driving device com-"prising a reciprocating member to turn the platen a single line space,connections whereby the driving operation of said member moves saiddetent clear of said wheel, and connections whereby the detent becomeseffective at the conclusion of the stroke of platen during ated by saidcam to swingthe detent clear of the ratchet teeth while any tooth ispassing the detent.

4. In a typewriting machine, the combination with a rotatable platen anda detent therefor, of a ratchet wheelconnected to the platen havingteeth to cooperate with said detent, a line-spacedriving devicecomprising a reciprocating member to turn the platen a single line spaceso that the detent will engage another tooth, a cam on saidreciprocating me'mber,and an arm operated by said cam to swing thedetent clear of the ratchet teeth while any tooth is pass ing thedetent, said arm having a section clear. of said cam.-at..the end. ofits: stroke to permit the detent to become eii'ectiveat the end ofthestroke.

' 5. In a typewriting machine, the combination with'a rotatableplatenand .a detent therefor, of a ratchet wheel connected to the 'platenhaving teeth to cooperate with said detent, a line-space driving devicecom-.

prising a reciprocating member to turn the platen a'single line space sothat the detent will engage another tooth, a pivoted arm carrying saiddetent, a cam extending from said arm, and a second cam on said membernormally ineffective but adapted during the driving motion of the memberto strike the first cam to carry the detent clear of the ratchet wheelteeth while any tooth is passing the detent.

6. In a typewriting machine, the combination with a rotatable platen anda detent therefor, of a ratchet wheel connected to the platen havingteeth to cooperate with said detent, a line-space driving devicecomprising a reciprocating member to turnthe platen a single line space,,a pivoted arm carrying said detent, a cam extending from said arm, anda one-way cam on-said member normally ineffective but adapted to de--press the first cam to carry the detent clear of the ratchet wheel andto be ineffective onthe return stroke of the member.

.7. In a typewriting machine, the combination with a rotatable platenand a -detent therefor, of a ratchet wheel connected to the platenhaving teeth to cooperate with said detent, a line-space driving devicecomprising a reciprocating member to turn the platen a single linespace, a pivoted arm carrying said detent, a cam extending from saidarm, a one-way cam pivoted on said member normally ineffective on thefirst cam, a lug on said member, and a spring adapted to hold thepivoted cam in position to strike the first cam, said first camcomprising 'a depression to permit the pivoted cam to swing toineffective position.

8. In a typewriting machine, the combination with a platen and a ratchetwheel connected thereto, of a detent arm for holding the ratchet wheel,a bell-crank arm fast to the detent arm, a reciprocating slide forrotating the platen, and a cam on said slide adapted to depress thebell-crank to swing the detent arm clear of the ratchet wheel.

9. In a typewriting machine, the combination with a rotatable platen anda ratchet wheel connected thereto, of a detent for the ratchet wheel, abell-crank comprising a cam, a reciprocating slide for turning theplaten, and a one-way cam on the slide adapted to depress the bell-crankand to stand clear thereof at the end of its stroke, and to returnineffective on the bell-crank.

10. In a typewriting machine, the combination with a rotatable platenand a ratchet wheel therefor, of a pawl for driving the platen, anoverthrow stop adapted to arrest the platen with the pawl in the ratchetwheel, and a detent ineffective during the driving stroke of the pawland made effective at the end of the stroke to hold the platen when thepawl is free from the overthrow stop.

11. In a typewriting machine, the combination with a rotatable platenand a ratchet wheel therefor, of a pawl for driving the platen, anoverthrow stop adapted to arrest the platen with the pawl in the ratchetwheel,

a detent, an arm connected to said detent, a

slide for the pawl, and a cam on the slide .said slide, said armcomprising a second cam on which said one-way vcam 1s effective, saidsecond cam comprislng a depression whereby the slide becomes ineffectiveat the end of the stroke, so that the detent becomes effective at theend of the stroke and remains effective during the return stroke.

13. In a typewriting machine, the combination with a rotatable platenand a ratchet wheel therefor, of a pawl for driving the platen, anoverthrow stop adapted to arrest the platen with the pawl in the ratchetwheel, and a detent ineffective durin the driving stroke of the pawl andmade e ective at the end of the stroke to hold the platen when the pawlis free from the overthrow stop and also adapted to remain effectiveduring the return stroke of the pawl.

14;. In a typewriting machine, the combination with a rotatable platen,of a slide for rotating said platen variable distances but having auniform stroke, a pawl for connecting the slide to the platen, anoverthrow stop for arresting the pawl at the end of its stroke, aratchet wheel for holding the platen, a detent normally resting in saidratchet wheel, and connections whereby said slide makes said detentineffective during the driving stroke of the pawl and permits .it tobecome efiective at the end of said stroke and thereafter to remaineffective.

' ALFRED G. F. KUROWSKI.

Witnesses:

EDITH B. LIBBEY, CATHERINE A. NEWELL.

